External Condensation forms on the outside surface of glass when its temperature drops below the outdoor dew point temperature.
External Condensation: Windows that have a double or triple glazed unit containing energy-efficient low-emissivity glass have better thermal insulation properties. This is a result of a high-performance transparent coating. Hence, this coating typically reflects heat from radiators or fires back into the room. As a result, the outer pane of glass does not get warm by heat escaping from inside the building through the glass. Thus, it remains cooler in comparison to less thermally efficient windows.
External condensation only occurs in certain climatic conditions. These are a variable combination of high relative humidity and clear cold conditions. The conditions are normally apparent in spring and autumn.
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